鸿蒙Hi3861来完成Wifi热点的连接并启动TCP SocketServer
导读 | 这次使用Hi3861来完成Wifi热点的连接,并启动TCP SocketServer,接收消息并将消息反馈TcpCLient。 |
主要做法是启动开发板Wifi,然后设置热点和密码等配置信息,再连接热点。
其中重要的是OnWifiConnectionChanged连接状态事件处理函数。该函数会在连接成功后设置全局变量g_connected=1,代表已经连接成功。
WifiEvent eventListener = {.OnWifiConnectionChanged = OnWifiConnectionChanged,
.OnWifiScanStateChanged = OnWifiScanStateChanged
};
WifiErrorCode errCode = RegisterWifiEvent(&eventListener);
void OnWifiConnectionChanged(int state, WifiLinkedInfo* info) {
if (!info) return;
if (state == WIFI_STATE_AVALIABLE) {
g_connected = 1;
} else {
g_connected = 0;
}
}
EnableWifi();
WifiDeviceConfig apConfig = {};strcpy(apConfig.ssid, "MyWifi");
strcpy(apConfig.preSharedKey, "12345678");
apConfig.securityType = WIFI_SEC_TYPE_PSK;
int netId = -1;
AddDeviceConfig(&apConfig, &netId);
这个状态在事件处理函数中设置。未连接成功时,系统会循环等待,知道事件设置该值。
ConnectTo(netId);while (!g_connected) {
osDelay(10);
}
struct netif* iface = netifapi_netif_find("wlan0");if (iface) {
err_t ret = netifapi_dhcp_start(iface);
osDelay(300);
}
int sockfd = socket(AF_INET, SOCK_STREAM, 0);
struct sockaddr_in serverAddr = {0};
serverAddr.sin_family = AF_INET;
serverAddr.sin_port = htons(port);
serverAddr.sin_addr.s_addr = htonl(INADDR_ANY);
bind(sockfd, (struct sockaddr *)&serverAddr, sizeof(serverAddr));
int backlog = 1;
listen(sockfd, backlog)
int connfd = -1;connfd = accept(sockfd, (struct sockaddr *)&clientAddr, &clientAddrLen);
recv(connfd, request, sizeof(request), 0);
send(connfd, request, strlen(request), 0);
lwip_close(connfd);lwip_close(socketfd);
err_t ret = netifapi_dhcp_stop(iface);Disconnect();
RemoveDevice(netId);
DisableWifi();
#include <errno.h>#include <stdio.h>
#include <string.h>
#include <stddef.h>
#include <unistd.h>
#include "ohos_init.h"
#include "cmsis_os2.h"
#include "wifi_device.h"
#include "lwip/netifapi.h"
#include "lwip/api_shell.h"
#include "lwip/sockets.h"
// 接收、发送的数据
static char request[128] = "";
// 未连接热点=0,已连接热点=1
static int g_connected = 0;
// 输出连接信息字符串
// 打印内容样例--> bssid: 38:47:BC:49:01:FA, rssi: 0, connState: 0, reason: 0, ssid: MyMobile
void PrintLinkedInfo(WifiLinkedInfo* info) {
if (!info) return;
static char macAddress[32] = {0};
unsigned char* mac = info->bssid;
snprintf(macAddress, sizeof(macAddress), "%02X:%02X:%02X:%02X:%02X:%02X", mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
printf("bssid: %s, rssi: %d, connState: %d, reason: %d, ssid: %srn", macAddress, info->rssi, info->connState, info->disconnectedReason, info->ssid);
}
// 连接状态改变事件处理
void OnWifiConnectionChanged(int state, WifiLinkedInfo* info) {
if (!info) return;
// 输出类似内容:OnWifiConnectionChanged 31, state = 1, info =
printf("%s %d, state = %d, info = rn", __FUNCTION__, __LINE__, state);
PrintLinkedInfo(info);
// 根据连接状态设置g_connected
if (state == WIFI_STATE_AVALIABLE) {
g_connected = 1;
} else {
g_connected = 0;
}
}
// 扫描状态改变事件处理
void OnWifiScanStateChanged(int state, int size) {
printf("%s %d, state = %X, size = %drn", __FUNCTION__, __LINE__, state, size);
}
void DisconnectTcpSocket(int connfd) {
sleep(1);
printf("do_disconnect...rn");
lwip_close(connfd);
sleep(1); // for debug
}
void CloseTcpSocket(int socketfd) {
printf("do_cleanup...rn");
lwip_close(socketfd);
}
static void TcpServerHandler(void) {
ssize_t retval = 0;
unsigned short port = 9118;
// 创建一个通信的Socket,并返回一个Socket文件描述符。第一个参数IpV4,第二个参数SOCK_STREAM类型,第三个指用到的协议
int sockfd = socket(AF_INET, SOCK_STREAM, 0);
// 客户端地址和地址长度
struct sockaddr_in clientAddr = {0};
socklen_t clientAddrLen = sizeof(clientAddr);
// 服务端地址
struct sockaddr_in serverAddr = {0};
serverAddr.sin_family = AF_INET;
// htons是将整型变量从主机字节顺序转变成网络字节顺序,就是整数在地址空间存储方式变为高位字节存放在内存的低地址处
serverAddr.sin_port = htons(port);
// 监听本机的所有IP地址,INADDR_ANY=0x0
// 将主机数转换成无符号长整型的网络字节顺序
serverAddr.sin_addr.s_addr = htonl(INADDR_ANY);
// 服务端绑定端口
retval = bind(sockfd, (struct sockaddr *)&serverAddr, sizeof(serverAddr));
if (retval < 0) {
printf("bind failed, %ld!rn", retval);
CloseTcpSocket(sockfd);
return;
}
printf("bind to port %d success!rn", port);
// 开始监听,backlog指Pending连接队列增长到的最大长度。队列满了,再有新连接请求到达,则客户端ECONNREFUSED错误。如果支持重传,则请求忽略。
int backlog = 1;
retval = listen(sockfd, backlog);
if (retval < 0) {
printf("listen failed!rn");
CloseTcpSocket(sockfd);
return;
}
printf("listen with %d backlog success!rn", backlog);
int outerFlag = 1;
while (outerFlag) {
// 接受客户端连接,成功会返回一个表示连接的 socket。clientAddr参数将会携带客户端主机和端口信息;失败返回 -1
// 从Pending连接队列中获取第一个连接,根据sockfd的socket协议、地址族等内容创建一个新的socket文件描述,并返回。
// 此后的 收、发 都在 表示连接的 socket 上进行;之后 sockfd 依然可以继续接受其他客户端的连接,
// UNIX系统上经典的并发模型是“每个连接一个进程”——创建子进程处理连接,父进程继续接受其他客户端的连接
// 鸿蒙liteos-a内核之上,可以使用UNIX的“每个连接一个进程”的并发模型liteos-m内核之上,可以使用“每个连接一个线程”的并发模型
int connfd = -1;
connfd = accept(sockfd, (struct sockaddr *)&clientAddr, &clientAddrLen);
if (connfd < 0) {
printf("accept failed, %d, %drn", connfd, errno);
CloseTcpSocket(sockfd);
outerFlag = 0;
}
printf("accept success, connfd = %d !rn", connfd);
// inet_ntoa:网络地址转换成“.”点隔的字符串格式。ntohs:16位数由网络字节顺序转换为主机字节顺序。
printf("client addr info: host = %s, port = %drn", inet_ntoa(clientAddr.sin_addr), ntohs(clientAddr.sin_port));
int innerFlag = 1;
// 接收消息,然后发送回去
while (innerFlag) {
// 后续 收、发 都在 表示连接的 socket 上进行;
// 在新的Socket文件描述上接收信息.
retval = recv(connfd, request, sizeof(request), 0);
if (retval < 0) {
printf("recv request failed, %ld!rn", retval);
innerFlag = 0;
} else if (retval == 0) {
// 对方主动断开连接
printf("client disconnected!rn");
innerFlag = 0;
} else {
printf("recv request{%s} from client done!rn", request);
// 发送数据
retval = send(connfd, request, strlen(request), 0);
if (retval <= 0) {
printf("send response failed, %ld!rn", retval);
innerFlag = 0;
}
printf("send response{%s} to client done!rn", request);
// 清空缓冲区
memset(&request, 0, sizeof(request));
}
DisconnectTcpSocket(connfd);
outerFlag = 0;
}
CloseTcpSocket(sockfd);
}
static void TcpServerTask(void *arg) {
(void)arg;
// 先定义两个Wifi监听器,一个连接改变、一个状态改变
WifiEvent eventListener = {
.OnWifiConnectionChanged = OnWifiConnectionChanged,
.OnWifiScanStateChanged = OnWifiScanStateChanged
};
// 等待10个系统Ticks。每个ticks多少个us,计算方式= 1000 * 1000 / osKernelGetTickFreq()
osDelay(10);
// 注册监听器
WifiErrorCode errCode = RegisterWifiEvent(&eventListener);
printf("RegisterWifiEvent: %drn", errCode);
// 设置Wifi热点信息
WifiDeviceConfig apConfig = {};
strcpy(apConfig.ssid, "MyMobile");
strcpy(apConfig.preSharedKey, "12345678");
apConfig.securityType = WIFI_SEC_TYPE_PSK;
int netId = -1;
// 启用Wifi
errCode = EnableWifi();
printf("EnableWifi: %drn", errCode);
osDelay(10);
// 设置Wifi热点配置信息,返回生成的网络Id-netId。
errCode = AddDeviceConfig(&apConfig, &netId);
printf("AddDeviceConfig: %drn", errCode);
// 根据网络Id连接到Wifi热点
g_connected = 0;
errCode = ConnectTo(netId);
printf("ConnectTo(%d): %drn", netId, errCode);
// 未连接完成,则一直等待。g_connected状态会在事件中设置。
while (!g_connected) {
osDelay(10);
}
printf("g_connected: %drn", g_connected);
osDelay(50);
// 联网业务开始,找到netifname=wlan0的netif。
struct netif* iface = netifapi_netif_find("wlan0");
if (iface) {
// 启动DHCP客户端,获取IP地址
err_t ret = netifapi_dhcp_start(iface);
printf("netifapi_dhcp_start: %drn", ret);
// 等待DHCP服务器反馈给予地址
osDelay(300);
// 执行线程安全的网络方法,第二个参数是voidFunc,第三个参数是errFunc。如果没有errFunc,那么就执行voidFunc。
// netifapi_dhcp_start/netifapi_dhcp_stop等都是调用的netifapi_netif_common方法。
// dhcp_clients_info_show显示信息
/*
server :
server_id : 192.168.43.1
mask : 255.255.255.0, 1
gw : 192.168.43.1
T0 : 3600
T1 : 1800
T2 : 3150
clients <1> :
mac_idx mac addr state lease tries rto
0 b4c9b9af69f8 192.168.43.56 10 0 1 2
*/
ret = netifapi_netif_common(iface, dhcp_clients_info_show, NULL);
printf("netifapi_netif_common: %drn", ret);
}
TcpServerHandler();
// 联网业务结束,断开DHCP
err_t ret = netifapi_dhcp_stop(iface);
printf("netifapi_dhcp_stop: %drn", ret);
// 断开Wifi热点连接
Disconnect();
// 移除Wifi热点的配置
RemoveDevice(netId);
// 关闭Wifi
errCode = DisableWifi();
printf("DisableWifi: %drn", errCode);
osDelay(200);
}
static void TcpServerEntry(void) {
osThreadAttr_t attr;
attr.name = "TcpServerTask";
attr.attr_bits = 0U;
attr.cb_mem = NULL;
attr.cb_size = 0U;
attr.stack_mem = NULL;
attr.stack_size = 10240;
attr.priority = osPriorityNormal;
if (osThreadNew((osThreadFunc_t)TcpServerTask, NULL, &attr) == NULL) {
printf("SunLaoTest-Fail Create");
}
}
APP_FEATURE_INIT(TcpServerEntry);
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